Core/Quests: implement the option to cast spells upon abandoning quests (#434)

* Core/Quest: Implement a way to cast Spells on Quest Abandon.

* Core/Player: add a missing ;

* Core/Quest: moved the Abandon Spell away from a own table into quest_template_addon.

sql/updates/world/4.3.4/2023_11_29_01_world_quest_abandon_spells.sql

@@ -0,0 +1,6 @@
+--
+ALTER TABLE `quest_template_addon`
+	ADD COLUMN `AbandonSpellID` INT(10) UNSIGNED NOT NULL DEFAULT '0' AFTER `TimeAllowed`;
+	
+-- Example
+UPDATE `quest_template_addon` SET `AbandonSpellID` = 74113 WHERE `ID` = 24958; -- Volcanoth!